Android facial recognition Unlock feature can be hacked using digital photo. Google Android provide feature "Ice Cream Sandwich" that unlock a phone via Facial recognition.
A blogger showed the facial recognition technology can be fooled if it is presented with a digital picture.
"While some of you think that it is a trick and I had set the Galaxy Nexus up to recognise the picture, I assure you that the device was set up to recognise my face. I have a few people there watching me do the video and if any one of them is watching this video I hope you can confirm that this test is 100% legit," he said in a YouTube video.
It is going to be work if the attacker has your digital photo. Thief can't recognize whose phone is ,so he can't be unlock it.